Question

P4.4 Calculate {a} the kinetic energy of an 85.0-kg athlete running at a speed of 10.0 m/s and (b) the kinetic energy of a 60.0-kg cheetah running at 31.0 m/s. (c) Compare the kinetic energy of the cheetah to the kinetic energy of the athlete.

Answer 1

Kinetic energy of amelet = t my? = 1/2 x OS X 10² = 4250 J (B) Kinetic enery of cheetan = Ź mu? = {X 60X 312 = 28830 J 28830 ) ) 42503 .: Kinetic energy of cheetan) Kinetic energy of Amelete

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Answer 2

SOLUITION :

a.

K.E. of athlete 

= 1/2 mass of athlete * speed of athelete^2

= 1/2 * 85 * 10^2

= 4250 J   (ANSWER).

b.

K.E. of cheatah 

= 1/2 mass of cheetah * speed of cheetah^2

= 1/2 * 60 * 31^2

= 28830 J   (ANSWER).

c.

K.E. of cheetah = 28830 / 4250 =  6.78 times the K.E. of athlete  (ANSWER).